198 CYCLOCARPINE | PLACODIUM 
poles, 7-13 p long, 8-5 p thick.—Mudd Man. p. 131; Cromb. 
Lich. Brit. p. 45; Leight. Lich. Fl. p. 178; ed. 3, p. 164. Lichen 
fulgens Swartz Nov. “Act. Upsal. iv. p. 246 (1784); Dicks. Pl. 
Crypt. fasc. iv. p. 24; Engl. Bot. t. 1667.  Lecanora fulgens 
Ach. Lich. Univ. p. 437 (1810); Cromb. Monogr. 1. p, 357. 
Squamaria fulgens Hook. in Sm. Engl. Fl. v. p. 195 (1833). 
Exsice, Cromb. n. 155; Larb. Lich. Ceesar. n. 27 & Lich. Hb. 
n. 296. 
The spores of the species are simple, but they appear to be poorly 
developed; there is sometimes an appearance of septation, with 
guttule at each pole. The thallus resembles other Placodia in the 
presence of parietin, which gives the yellow colour to the thallus. 
When dry it is whitish suffused, becoming more brightly coloured 
when moistened. The spermogones are like others of the order 
with spermatia 3 » long, 1 » thick. 
Hab, Creeping over the mosses of calcareous soil, shell-sand and 
crevices of rocks in maritime districts.— Dist. Not uncommon in 
a few localities of the Channel Islands, S. England and S. Wales.— 
B. M. Quenvais, Jersey; Guernsey; Bray Hill, St. Minver and 
Withiel, Cornwall ; Freshwater Bay, I. of Wight ; Newhaven and 
Rottingdean Cliffs, Sussex; Stackpole Court and Lydstep, Pem- 
brokeshire. 
Spores polarilocular. 
Thallus entirely lobate. 
2. Pl. callopismum Mér. Nouv. Fl. Envs Paris, ed. 2, i. 
p. 184 (1821).—Thallus orbicular, radiate-stellate, closely adnate, 
the lobes of the circumference dilated, contiguous, plane, light- 
or orange-yellow, more or less pruinose, the centre cracked-areo- 
late, often deeper in colour or brown (K + purplish). Apothecia 
plane, becoming convex, the disc reddish-yellow, the margin 
paler, tlexuose or subcrenulate ; spores very wide, lemon-shaped, 
10-16 p» long, 6-10 p thick—Mudd Man. p. 133, t. 2, fig. 42; 
Cromb. Lich. Brit. p. 45; Leight. Lich. Fl. p. 176; ed. 3, 
p- 162. Lichen candelarius B. Lightt. Fl. Scot. ii. p. 811 (1777) ! 
L. murorum Sm. Engl. Bot. t. 2157 (upper fig.) (1810). idee 
callopisma Ach. Lich. Univ. p. 437 (1810) (non Hoffm.) ; Cromb. 
Monogr. i. p. 362 (excl. subsp. sympagea). 
Exsice. Johns. n. 405; Larb, Lich. Hb. n. 164; Leight. 
n. 113, 
Well marked by the thin flat lobes of the circumference, frequently 
there is a white zone near the edge. It is also distinguished by the 
broad citriform spores. 
Hab. On rocks and the mortar of walls in maritime and inland 
districts. — Distr. Not frequent throughout the British Isles.— 
DB, M, Guernsey; Plymouth and near Torquay, Devon; near Ciren- 
cester, Gloucestershire ; Bathampton Downs, Somerset; Great Orme’s 
Head, Carnarvonshire ; near Bonsall, Long Priory and Llanymynech 
Hill, Shropshire ; Quy Churchyard, Cambridgeshire ; Blair Athole, 
Verthshire; near Aberdeen. 
